Marley joined the Tulane Green Wave football team in 2013. It was the only NCAA D-I Football Bowl Subdivision institution to offer him a scholarship, and only two NCAA D-I Football Championship Subdivision institutions did. As a freshman, he was named Conference USA Co-Freshman of the Year and a member of the C-USA All-Freshman Team, with 67 tackles in 13 games. In 2014 he got an All-American Athletic Conference Honorable Mention with 82 tackles in 12 games. In 2015, he was named a member of the All-American Athletic Conference First Team, with 82 tackles in 12 games. In 2016, he was named again a member of the All-American Athletic Conference First Team, with 88 tackles in 12 games. He graduated in business management and marketing.